Hydrocarbon Distribution Pattern of Superimposed Unconformity Structure: A Case of Carboniferous Donghe Sandstone in Tazhong Area, Tarim Basin, NW China

doi:10.19657/j.geoscience.1000-8527.2018.06.04

Abstract

Abstract:

In this paper, we discuss: (1) the unconformity types along the Donghe sandstone third-order sequence boundary; (2) different ways of hydrocarbon migration and accumulation caused by space-time orderly distribution of unconformity structures. The Donghe sandstone can be divided into superstratum of the unconformity (bottom), in-place carrier bed, residual regolith, weathered clay bed, superstratum of unconformity (top) and regional cap rock. Pool-forming units are different in the northwest and southeast of the district. They can form 2 groups and 7 types of pool-forming structures, with the former corresponding to two groups of reservoirs. Major structures are separated in the northwest. Hydrocarbon can migrate below the weathered clay bed and regional cap rock, forming the unconformity-blocked reservoir group, including anticlinal reservoir of superstratum of unconformity (top), lithologic reservoirs of superstratum of unconformity (top) and low amplitude anticlinal reservoir of residual regolith. Structures are connected in the southeast, and the hydrocarbon may have migrated below the superstratum of unconformity (bottom) and regional cap rock, forming the unconformity-connected reservoir group, including connected anticlinal- and connected stratigraphic overlap reservoirs. This finding facilitates further hydrocarbon exploration in the Donghe sandstone.

Key words: unconformity, hydrocarbon accumulation type, Donghe sandstone, superimposed unconformity structure, Tazhong area

CLC Number:

TE122

WANG Tao, XU Huaimin, DENG Xili, DONG Shaoqun, JIANG Tongwen, ZHOU Xinping, HUANG Ya. Hydrocarbon Distribution Pattern of Superimposed Unconformity Structure: A Case of Carboniferous Donghe Sandstone in Tazhong Area, Tarim Basin, NW China[J]. Geoscience, 2018, 32(06): 1150-1160.

Figures/Tables 8

Fig.1 Regional map showing the location of the Tazhong area and stratigraphic classification of the Donghe sandstone

Fig.2 Formation model of the unconformity above the Donghe sandstone in the Tazhong area

Fig.3 Hydrocarbon accumulation structures of the Donghe sandstone

Fig.4 Unconformity structural profile in the Tazhong area

Fig.5 Superimposed unconformity structural types

Fig.6 Reservoir profile of unconformity blocked reservoirs group

Fig.7 Reservoir profile of unconformity connected reservoirs group

Fig.8 Hydrocarbon accumulation model of superimposed unconformity structure in the Tazhong area

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